Last week, Bing was hit by a cache bug that showing third party content. That was an unusual bug that contains cache page results.
Do Read: Inorganic Site Structure Spam Penalties Bing
Problem:
The Bing cache bug was not only showing the cache page that the user website contains but also the content from the third party sites.
Solution:
Bing resolves the issue within 24 hours after the issue was reported to the company. The company said it was a bug, not a hack so there is nothing to worried about.
Tweet By The Company:
Thanks for reporting. We're aware of the issue that caused occasionally Bing cache page to display content from other pages. We are on top of it and rolling out a fix. Bing search Index and results are not impacted by this issue.
— Microsoft Bing Webmaster Team (@BingWMC) November 8, 2019